Preyfell

The underground is in constant war between life and death the ground is covered in deceased creatures the air carries there screams and dust the monster population has took to many hits to last any longer when frisk returned she was traumatised after seeing the ones she called friends scramble for any meat available frisk was always frightened before the feast but now she cant walk anywhere without any support or encouragement from flowey who has to be the brave one this time to protect frisk from the creatures he made out of loneliness. But surprisingly they managed to befriend the devil and his hellhound who have destroyed most of the population of snowdin and the ruins not even the most strongest monsters will try to hunt them because then they would just be another life lost to the hunger the top predators of snowdin,waterful and hotland made a pact to never enter each other's territories but only if the amalgams start another rampage this was made to keep peace between the three top predators and keep their prey population to a good level so they dont starve

Monsters
Flowey tries to protect frisk from anything that will hurt her even his own desire to kill and devour, napstablook haunts the ruins without any rivals to fears, sans and toby hunt any living creature without any mercy while papyrus hides inside too scared to see the outside world, riverperson glides through the blood stained waters with glee, undyne rules over waterful wearing the skin and shell of her old friend, alphys rules hotland and new home with mechanised parts from her old friend and the amalgams try to find any food before being hunted by the alpha predators and only a few temmies and spiders scavenge on any food they find the other monsters have either went extinct or went into hiding